Single-needle spray head for jet printing and jet printing device

The invention relates to a single-needle spray head for jet printing and a jet printing device. The single-needle nozzle comprises a metal plate, the metal plate comprises a first through hole located in the center of the metal plate, and the first through hole is used for installing the single-needle nozzle; the spraying needles are used for circulating liquid to be sprayed and printed, and the spraying needles are arranged on the edge of the metal plate; the piezoelectric material unit is arranged on the first side of the metal plate and used for driving the metal plate to move under the control of the driving electric signal, so that the liquid to be printed is sprayed out of the spray needle, and the piezoelectric material unit comprises a second through hole formed in the center of the piezoelectric material unit and used for installing the piezoelectric material unit; and the coating material is arranged on the surface of the piezoelectric material unit. The multi-nozzle splicing device is convenient to